In Reply to: Re: Using larger power transformers in low power-draw source components posted by Dan Banquer on June 21, 2004 at 07:11:23:
Hi, Dan,Perhaps I can comment on your reply, as well as answering the Qs you had:
* "Most low VA rated toroidal transformers have poor regulation specs vs. a higher VA rated toroidal transformer."
Good point ... I would think this would result in the sound being "cleaner" but why would it deliver more "substance/heft" to the sound?
* "Is the power supply configuration in the unit adaptable to this?"
Sorry, don't understand the Qu.
* "Does the transformer secondary have a centre tap to ground?"
Yes.
* "Therefore current is reduced by half."
Yes, but the original 30VA transformers delivered 1 amp at 15v on each secondary. The current draw on each rail (measured) is 65ma ... so I would've thought 1 amp was plenty. I replace the 30VA transformers with 160VA 15-0-15v transformers, which are able to deliver 5.3 amps on each secondary.
* "How well is the transformer coping with the capacitative load of the power supply?"
I don't know.
The power supply is designed for small constant-current-draw source components, not power amps. It has a 680uF cap for each rail directly after the diode bridge (10 x expected output current), then rail regulation is done by an emitter follower transistor.
Hope this info helps.
Regards,
Andy
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: Using larger power transformers in low power-draw source components - andyr 14:06:25 06/21/04 (9)
- Re: Using larger power transformers in low power-draw source components - Dan Banquer 15:50:08 06/21/04 (8)
- Re: Using larger power transformers in low power-draw source components - andyr 16:07:34 06/21/04 (7)
- Re: Using larger power transformers in low power-draw source components - Dan Banquer 17:45:53 06/21/04 (6)
- Re: Using larger power transformers in low power-draw source components - andyr 19:24:59 06/21/04 (5)
- You might also try other types of transformers - Commuteman 13:50:29 06/22/04 (4)
- Good suggestion - Sean 00:18:46 06/23/04 (2)
- Shirley that's the whole point of this and the other AA Forums?? - andyr 02:25:20 06/23/04 (1)
- Re: Don't call him Shirley !!!!!! NT - slope 08:30:27 06/23/04 (0)
- Thanks, Peter, I will investigate. (nt) - andyr 14:04:39 06/22/04 (0)